Device for grinding external cylindrical surfaces



0d. 20, 1931. v Q HUTTO 1,827,789

DEVICE FOR GRINDING EXTERNAL CYLINDRICAL SURFACES Filed July 11, 1928 6 Sheets-Sheet l 37 56 ,.Iiy.i,

Oct. 20, 1931. M c HUTTQ 1,827,789

DEVICE FOR GRT [NDING EXTERNAL CYLINDRICAL SURFACES 6 Sheets-Sheet 2 Filed July 11. 1928 Oct. 20, 1931.

M. c. HUTTO Filed July 11, 1928 6 Sheets Sheet Oct 20, 1931. C -r0 1,827,789

DEVICE FOR GRINDING EXTERNAL CYLINDRIGAL SURFACES Filed July 11, 1928 6 Sheets-Sheet 4 Oct. 20, 1931. r M c, -r0 1,827,789

DEVICE FOR GRINDING EXTERNAL CYLINDRICAL SURFACES Filed July 11, 1928 6 Sheets-Shee,t 5

jnmnioa WWW M Qct. 20, 1931. M. c. HUTTO 7,

DEVICE FOR GRINDING EXTERNAL GYLINDRICAL SURFACES Filed July 11, 1928 6 Sheets-Sheet 6 Patented Get. 20, 1931 UNITED STATES PATENT orrlca MARSDEN C. HUTTO, OF DETROIT, MIGHIGAN, ASSIGNOR TO HE'TTO ENGINEERING COM- PANY, INC., A CORPORATION OF MICHIGAN DEVICE FOR GRINDING EXTERNAL CYLINDRICAL SURFACES Application filed July 11,

This invention relates to a grinding device and more particularly to a device of this charactor for grinding, polishing or simllarly treating the external cylindrical surfaces of shafts, cranks, rods, cylinders and the like.

It is the object of this invention to rovide an apparatus of simple, durable an efficient construction whereby such work may be done thoroughly, accurately and expeditiously with a minimum expenditure of power and which can be adjusted with ease and facility so as to adapt the tool to the work inhand and permit of taking up wear as theoperation of the tool progresses.

Inthe accompanying drawings: a

Figure '1 is a longitudinal section showing one embodiment of my improvements.

Figure 2 is an end elevation of the same.

Figure 3 is a cross section taken on line 33 Fig. 1.

Figure 4. is a fragmentary longitudinal section taken on line 4-4 Fig. 3.

Figure 5 is a longitudinal section of am other form of grinding device containing my invention. 2 j

Figure 6 is a fragmentary end elevation of the same.

Figures 7 and 8 are transverse sections taken on the correspondingly numbered lines in Fi 5.

Figure 9 is a fragmentary horizontal section taken on line 9-9 Fi 5.

In the following description, similar characters of reference indicate like parts in the several figures of the drawings. The form of grinding device illustrated in Figs. 1, 2, 3 and 4 is constructed as follows: The numeral 10 represents the body of the tool which is preferably of tubular form and made of metal of any suitable character, and the member or article 11 which is adapted to be ground on its outer cylindrical surface or periphery by means, of this tool is adapted to be received lengthwise within the bore or longitudinal opening of the body. The member to be ground may either be a shaft, crank or other object which has an external cylindrical surface adapted to be operated upon, and in the present case this member is reprelengthwise of the in length and flush. with the opposite ends 1928. Serial No. 291,784.

senite; by dotted lines as shown in Figs. 2 an Within the bore of this body is arranged a plurality of abrasive members which are adapted to engage with the periphery of the article to be ground or treated, these abrasivemembers being arranged in an annular row and preferably equidistant around the axis of the body.

Although these abrasive variously constructed each shown in the drawings, referably consist of a channel shaped hol der 12 arranged body and members may be of, the same, as

preferably equal of-the same, and an 'abrasive surface arrangedon the inner side of the holder and consisting preferably-of a longitudinal stick or stone 13'of carborundum'or other suitable abrasive material, which is secured in the inner side of the channel shaped holder 1n any approved manner."

Each of these abrasive holders is guided on the body of the tool so as to be capable of radial movement thereon toward and from the axis of the tool and thereby permit the abrasive inner surface of the-holder to be expanded'or contracted to suit the diameter of the cylindrical surface which is to be ground. Various means may be employed for thus guiding the abrasive member on the body, but in the construction shown in Figs. 1, 2 and 3, this is accomplished by means of longitudinal radial guide grooves 14 formed in the bore of the body and adapted to receive one of the abrasive holders between the ends thereof, and two guide rings 15 seated in annular rabbets 16 at opposite ends of the body and detachably secured therein by means of screws, the shanks 17 of which pass throu 'h openings in these guide rings and tap into t e adjacent parts of the body while the heads 18 bear against the outer sides of these rings, each of these rings being provided on its 1nner edge with a plurality of radial guide ways or slots 19 which receive the'adjacent .end portions of the res ctive abrasive holders, as bestshown in Figs. 1 and 2.

By selecting a pair of guide rings of the right size from a set having different interby means of the grooves holders to adapt nal diameters it is possible to guide the for grinding cylindricaL ly support the same objects which are of difierent diameters and still utilize the same supporting body 10 and the other parts of the tool which are associated therewith. In addition to radially guiding these abrasive members on the body 14 in the body and the grooves 19 in the guide rings 15, each of the abrasive members may be further guided in its radial movement toward and from the axis of the tool by means of guide pins 20 secured at their inner ends to the outer side of the respective holder adjacent to opposite ends thereof and projecting radially outward through guide openings 21 in the adjacent part of the body 10, as shown in Fig. 1.

These guide pins 20 are fitted somewhat loosely in the guide openings 21 so as to not only permit the abrasive member to move radially on the body, but also to tilt a limited extent relative to the axis thereof in order to permit the abrasive inner surfaces of the themselves to any irregularities of the cylindrical surface to be ground which may be out of round or parallel, and thereby enable the several abrasive members to gradually grind downthe cylindrical surface which may be out of true until the same is perfectly cylindrical.

Means are provided for ad usting the working diameter of thetool which cooperate with the abrasive members so as to positively and rigidly hold the same against expansion during the grinding operation and still permit them to rock so that they can adapt themselves to any irregularities on the surface of the object which is being ground.

In the construction shown in Figs. 1 -3 this is accomplished by means which comprise two oppositely disposed internal cones 22, 23 which are preferably constructed in the form of rings and arranged around opposite ends of the body 10 and engage respectively with the guide pins 20 at opposite ends of the abrasive members. Upon moving these cones lengthwise of the axis of the tool in one d1? rection the abrasive members are forced inwardly due to the wedge action of these cones against the outer ends of the guide pins 20 and thereby contract the working diameter of the tool, while upon moving these cones in the opposite direction lengthwise of the axis of the tool the abrasive members are permitted to expand and thereby increase the working diameter of the tool.

In the construction shown in Fig. 1 the conical surfaces of the two cones flare inwardly or toward each other, and the adjustment of the same relatively to one another lengthwise of the tool is effected by means of a casing or shell 24, one end of which is rigidly connected with the cone 22 and preferably formed integrally therewith while the other preferably end cone 23 is slidable lengthwise within the opportions of the several stone holders and firmposite end of this casing,

and an adj usting sleeve or ring 25 engaging with the outer end of the last-mentioned cone and having a screw connection 26 with the adjacent part of the casing 24.

Upon tightening the screw sleeve 25 on the To facilitate the turningof the adjusting sleeve 25 the same is provided with a longitudinal extension 27 the periphery of which is provided with a plurality ofopenings 28- adapted to receive a wrench or other tool for turning this sleeve in the desired direction.

The longitudinal movement of thecones in the direction for causing them to spread and permit the working diameter of the tool to be increased is preferably effected by resilient means which in the present case consist of sprin s 70, preferably three in number, arrange in an annular row in the space between the body 10 and the cone casing 24 and each interposed between the inner opposing ends of the cones, and a retaining or longitudinal guide rod 71 upon which each is secured to the cone 22 while the other end thereof slides in a longitudinal opening 72 in the cone 23, as best shown in Fig. 1.

Upon unscrewing the sleeve 25 the two cones are spread apart lengthwise of the tool in the same measure. The several abrasive members are yieldinglg held in their outermost radial osition so at their guide'pins 2O abut against the adjusting cones 22 and 23, this being preferably efiected by two garter springs 29 arranged adjacent to opposite ends of the supporting body 10 and the abrasivemembers, and each of these springs being engaged with the outer sides of the heads 15 of the screws whereby the guide rings are secured to the body and with the inner sides of retaining lugs or pro ections 30 arranged at'the corresponding ends of the holders of the abrasive members.

The screw heads 15 are provided on the periphery of the same with annular grooves 31 in which the adjacent parts of each expansion spring 29 is seated and the projections 30 are constructed in the form of hooks so that screw heads 15 and books 30 the same are prevented from becoming detached from these when these springs engage with the members. Inasmuchas the'screw heads 15 and the retaining lugs 30 of the abrasive members alternate with each other and are arranged on concentric circlesof different diameters, each ofthe springs 29 is deflected at intervals throughout the circumference thereof and thereby provides a resilient action which constantly tends to move the abrasivemembers outwardly to the fullest extent permissible by the position of the cones 22 and 23.

Means are provided for permitting the cones to move lengthwise relative to the body of the tool but preventing these cones and the body from turning circumferentially rela tively to each other. In the preferred construction these means consist of one or more retaining pins 32, preferably three, arranged equidistant around the body of the tooland each provided at its inner end with a screw threaded shank 33 secured in a threaded opening in'the adjacent part of the body, while its outer part projects radially outward through a longitudinal slot 34 in the adjacent part of the cone 23 and a longitudinal slot 35 in the casing 24 which is connected with the other cone 22. Obviously these retaining pins operate as keys or splines which permit the cones to be moved freely lengthwise relative to each other and also relative tothe body 10 of the tool for adjusting the abrasive members to the desired diameter of the working surface, and also permit the abrasive members to tilt in adapting themselves to any out of true cylindrical condition of the surface which is being ground, while at the same time preventing these cones and the supporting body 10 from turning circumferentially one relatively to the other.

Means are provided for supporting the body 10 of the tool so as to permit the same to tilt relative to the axis of the object which is being ground and thereby compensate for any variation in the axial alignment of the abrasivemembers relatively to the axis of the work piece which is being ground. Although the means for thus supporting the body of the tool may be variously constructed the form .which is shown in the drawings is satisfactory and constructed as follows The numeral 36 represents a swivel rin which surrounds the central part of the annular casing 24 upon which the cones are mounted, which ring is rigidly connected with the body 10 so as-to move in unison therewith, this being preferably accomplished by providing this ring with countersunk openings 37 which receive the outer headed ends 38 of the retaining pins 32 so that the latter in effect form the double function of screws for connecting the swivel ring 36 with the body and also as keys or splines which hold the cones against turning on the body, but permit the cones to move lengthwise thereon. The swivel ring 36 is arranged within an opening of a supporting bracket 39, the joint between the periphery of this ring and the bore of the bracket 39 being preferably so constructed that this ring together with the parts mounted thereon is capable of rocking within the bracket transversely of the axis of the tool.

This is preferably accomplished by providing the periphery of the swivel ring with a convex spherical surface 40 and engaging the same with a concave surface in the bore of the supporting bracket 39. This concave surface in the supporting ring preferably consists of two cones 41, 42 which flare inwardly toward each other from opposite sides of the bracket 39.

The conical surface 41 formed on an integral part of while the other conical surface 42 is formed on a section 43 of the bracket which is detachably connected by means of screws 44 witlrthe main part of this bracket, as shown in-F g. 1. By this means the bracket 39 is provided in effect .with a concave socket which is engaged by the convex surface 40 of the swivel ring which operates to permit the tool to rock on the bracket due to the swlvel oint between the swivel ring and the bracket, but holds the body and the parts associated therewith against lengthwise movement on the bracket.

Rotation of the grinder body 10 and parts associated therewith rela ive to the bracket is prevented by a retaining pin 45. secured to the bracket and engaging with a longitudinal groove 46 formed in the periphery of the swivel ring 36.

' The extent of the rocking or floating movement of the tool body 10 and the parts assoelated therewith is limited by means of a limiting pin 47 mounted by means of a screw oint 48 on a part of the bracket body and engagrng with a longitudinal groove 49 in the swivel ring, the opposite ends 50 of this las-mentwned groove forming stops which are adapted to engage with opposite sides of thestop or limiting pin 47 and thereby arrest the swivel ring when the same has reached a predetermined position upon rock- 111g in either direction from its central or is 1 preferably g neutral position.

In using this tool the same may be mounted so that the abrasive members are incapable of rotary motion, but are only capable of radial movement toward and from'the axis of the tool and also rocking relatively thereto,

in which case the cylindrical object of which the bracket 39, v

the periphery is to be ground is rotated while in engagement with the abrasive faces of the abrasive members, and this object is also reciprocated lengthwise of the axis of the tool so that by this combined rotary and longitudinal movement of the object the requisite grinding of its nerioherv is accomplished by engagement of the same with the abrasive members.

the work piece The tool shown in Figs. 1, 2, 3, 4 is more particularly designed for use in this manner which the tool 1s mounted may be rotated and g0 ner of using an extent for this purpose.

one relatively also reciprocated lengthwise of the axis of the work piece for-the-purpose of grinding the cylindrical peripheral surface of the work piece to the requisite extent, this manthe tool being a mere reversal of that previously described. The same efi'ect is produced if the grinding tool is rotated and the working piece reciprocated lengthwise, or vice versa.

In using the tool in any of the ways just described the abrasive members are set up so as to fit the surface to be ground on the work piece by moving the adjusting cones 22 and 23 relatively to each other the requisite When the tool has been thus adjusted the abrasive members will be held positively in this position and prevented from radially moving outward so that upon rotating the work piece and the stones tion of the stones upon the work piece will be produced circumferentially of the latter, and upon moving the work piece and the tool lengthwise one relatively to the other this traversing action will cause the grinding effect on the work piece-to be extended lengthwise over the work piece correspondingto the longitudinal stroke of the work piece and tool relatively to one another.

When the grinding has proceeded sufliciently to cause the stones to free themselves from the surface of the work piece, then the adjusting sleeve 25' is again tightened so as to draw the cones 22, 23 together and thereby push the abrasive members inwardly for again bringing them in close working contact with the work piece, this operation of tightening and then operating the tool until it is again free being repeated continuously until the desired amount of grinding or polishing on plished. During this grinding operation of theabrading members the adjusting cones operate as a floating adjusting device which permits the cones to automatically move lengthwise of the tool in one direction or the other under the pressure of the abrasive members and thereby enable one end of the abrasive members to project inwardly toward the axis of the tool to a greater extent to the other, the grinding a cthe work piece has bee-n accom- P bearing lugs teear'ee than the opposite ends of the same so that these abrasive members can adapt themselves during the initial portion of the grinding operation to any out of true condition-of the cylinder surface of the work piece. As the grinding of such an out of truework piece.

proceeds the abrasive members gradually true up this irregularity in the work piece and ultimately grind the same into true cylinder form during which operation the cones au omatically shift their osition as a unit relatively to the axis of tiie tool and adapt themselves to the gradually straightening position of the abrasive members until the latter finally assume a position in which their faces are parallel with the axis of the tool and complete the grinding operation while thus arranged.

It is therefore possible by this means to produce a perfectly cylindrical periphery or external surface on a work piece such as a shaft, rod, pin, cylinder or the like of any desired diameter or length within the limits of the capacity of the machine, and'to grind such external cylinder surface perfectly true and accurate throughout the entire circumference and length of the same. This can be accomplished with ease and facility and with a minimum expenditure of power, thereb materially reducing the cost of doing sucii work as well as improving the quality of the same.

In the modified form of this grinding device shown in Figs. 5-9 the body 10a'of the tool is incapable of a rocking or swivelling motion on the bracket 39a and instead is rigidly secured thereto by screws 52 connecting this bracket with an external flange 53 at one end of.the body, as shown in Fig. 1. Turning of the cones relatively to the body but permitting longitudinal movement of the same relatively to one another and the body is permitted by a retaining pin 54 on the flange 53 "of the body engaging with a longitudinal opening 55 in the cone casing 24, and a retaining pin 56 on the cone casing engaging with a longitudinal groove 57 inthe sliding cone 23.

In this modified form of my invention,

operative engagement of the cones with the abrasive members is obtained by a plurality of longitudinal adjusting plates 57 arranged in an annular row around the bore of the bodv 10a. and each arranged in a longitudinal radial slot or guideway 58 in the body, and rovided with rounded ends 59 engaging with hardened guide pins 60 mounted on the body at opposite ends of the respective slot. On its inner edge each adjusting plate is provided at its ends with inwardly projecting of the adjacentabrasive holder near opposite ends thereof, and on the outer edge of each adjusting plate at the ends thereof the same is provided with outwardly projecting bear- 61 engaging with the outer side ing lugs 62 which engage respectively with the ad usting cones 22, 23.

Upon adjusting the cones 22, 23 len h- 2 Wise relative to each. other theiwedging e ect of the same is transmitted through the adjusting plates to the abrasive members which are yieldingly held in their expanded posi tion by garter springs 29, each engaging with lugs 18a on one end of the several abrasive holders 12 and lugs 15a arranged on the corresponding end of the body 10a and alternating with the holder lugs 18a.

The operation of this tool is substantially the same as that shown in Figs. 1-4 inasmuch as the adjusting plates are free to rock in the slot 58 as the abrasive'members tilt upon engaging an out-of-round or irregular part of the work piece and then automatically return .the abrasive members to their normal position in which they are parallel with the axis of the tool when the non-straight or uneven surfaces-of the work piece have been ground down.

In this construction the cones also float as a normally non-expansible unit as part of the adjusting mechanism for the abrasive members which positively holds the latter to their work but permits the same to tilt for overcoming irregularities, and also readily permitting of adjusting the working diameter of the abrasive members by adjusting the cones relative to each other lengthwise of the axis of the tool topermit grinding articles of different diameter and also for taking up wear on the abrasive members and compensating for stock removed by grinding from the surface of this work piece.

I claim as my invention:

1. A grinding device comprising a 'body provided with a longitudinal passage for the reception of the article to be ground, a plurality of abrading members arranged in an annular row around said passage and having abrading surfaces at their inner sides adapted to engage the periphery of said'articles, and a controlling deviceicooperating with said abrading members and having parts arranged externally of'said body and adjustably rigid relative to each other to positively fix the general limit of expansion of said members,

* and spring means for yieldingly drawing said abrading members laterally outward comprising relatively movable projections arranged at opposite ends of said abrading members,

relatively fixed projections arranged at opposite ends of said body and alternating with j the movable projections at the respective ends of the abrasive members, and springs each engaging with the projections at the corresponding ends of the abrasive members and the body.

2. A grinding device for operating on external cylindrical surfaces, comprising a tubular supporting and driving body adapted to receive the article to be ground, a plurality row within said body and each extending lengthwise thereof and provided on its inner side with an abrasive surface, guide rings which are detachably mounted on opposite ends ofsaid body and interchangeable with others of different diameter, and which said abrasive members are provided with radial slots for receiving and guiding them radially relative to the axis of the tool, and means for controlling the position of said abrasive members relative to the article to be ground.

3. A grinding device for operating on external cylindrical surfaces, comprising a tub ular body adapted to receive the article to be ground, a plurality of abrading members arranged in an annular row within said body and each extending lengthwise thereof and provided onits inner side with an abrasive surface, guide rings which are arranged at opposite ends of said body and upon which said abrasive members are guided radially relative to the axis of the tool, screws for securing said rings to said body and having relatively fixed heads, lugs arranged at opposite ends of the abrasive members, springs engaging with said heads and lugs and operating to draw said abrasive members radially outward, and adjustably rigid means cooperating with said abrasive members and operating to positively limit the expansion of the same.

4. A grinding device for operating on ex ternal cylindrical surfaces, comprising a tubular body, a plurality of abrasive members arranged 1n an annular row around the bore of said body and each having an abrasive inner surface adapted to engage the periphery of the article to be operated upon, oppositely disposed cones arranged on the exterior of said body and operatively engaging with opposite ends of said abrasive members and both movable lengthwise of the'axis of the tool, and means for adjusting said cones relatively to one another lengthwise of said body, including a casing one end of which is connected with one of said cones and in the other end of which the other cone is slidable lengthwise and an adjusting sleeve engaging the last-mentioned cone and having a screw connection with said casing.

5. A grinding device for operating on external cylindrical surfaces, comprising a tubular body, a plurality of abrasive members arranged in an annular row around the bore of said body and each having an abrasive inner surface adapted to engage the periphery of the article to be operated upon, oppositely disposed cones arranged on the exterior of said body and operatively engaging with op posite ends of said abrasive members and both movable lengthwise of the axis of the tool, means for adjusting said cones relatively to one another lengthwise of said body, and

- means for eausin said adjusting means to turn with said bo y.

6. A grinding device for operating on external cylindrical surfaces, comprising a tubular body, a plurality of abrasive members arranged in an annular row around the bore of said body and each having an abrasive inner surface adapted to engage the periphery of the article to be operated upon, oppositely disposed cones arranged on the eX terior of said body and operatively engaging with opposite ends of said abrasive members and both movable lengthwise of the axis of ternal cylindrical surfaces. comprising a tubular body, a plurality of abrasive members movable radially on said body and having abrasive surfaces on their inner sides for engaging the periphery of the articles to be operated upon, and a swiveling support for said body. i

8. A grinding device for operating on external cylindrical surfaces, comprising a tubular body, a plurality of abrasive members movable radially on said body and having abrasive surfaces on their inner sides for engagin the periphery of the articles to be operated upon, a supporting bracket, and a swivel member supporting said body and capable of rockingon said bracket.

9. A grinding device for operating on external cylindrical surfaces, comprising a tubular body, a plurality of abrasive members movable radially on said body andhaving abrasive surfaces on their inner sides forengaging the periphery of the articles to be operated upon, means for adjusting said abrasive members radially including oppositely disposed cones surrounding said body and operatively engaging said abrasive members at opposite ends thereof, a casing upon which said cones are mounted, a supporting bracket and a swivel ring mounted on the exterior of'said casing and having an external spherical surface engaging with an internalspherical surface on said bracket.

10. A grinding device for operating on external cylindrical surfaces, comprising a tubular body, a plurality of abrasive members movable radially onsaid body and having abrasive surfaces on their inner sides for engaging the periphery of the articles to be operated upon, means for adjusting said abrasive members radially including oppositely disposed cones surrounding said body memes and operatively engaging said abrasive members at opposite ends thereof, a casing upon which said cones are mounted, a supporting bracket, and a swivel ring mounted on the exterior of said casing and having an'ex- 11. A grinding device for operating on external cylindrical surfaces, comprising a tubular body, a plurality of abrasive members arranged in an annular row within said body and guided thereon for radial movement relative to the axis thereof, means for adjusting said abrasive members radially including cones operatively engaging opposite ends of said abrasive members, a casing which is arranged on the exterior of said body and upon which said cones are mounted, a supporting bracket, a swivel ring interposed between said casing and bracket and pivotally mounted on the bracket, and a coupling member connected with said body and swivel ring and passing through a longitudinal slot in said casing.

12. A grinding device for operating on external cylindrical surfaces, comprising a tubular body, a plurality of abrasive members arranged in an annular row within said body and guided thereon for radial movement relative to the axis thereof, means for adjusting said abrasive membersradially including cones operatively engaging opposite ends of said abrasive members, a casing which is arranged on the exterior of said body and upon which said cones are mounted, a supporting bracket, a swivel ring surrounding said casing and capable of rocking in said bracket, and means for limiting the rocking motion of said ring in said bracket.

13. A grinding device for operating on ex-' 1 ternal cylindrical surfaces, comprising a tubular body, a plurality of abrasive members arranged in an annular row within said body and guided thereon for radial movement relative to'the axis thereof, means for adjusting said abrasive members radially including I conesoperatively engaging opposite ends of said abrasive members, a casing which is arranged on the exterior of said body and upon which said cones are mounted, a supporting bracket, a swivel ring surrounding said casing and capable of rocking in said bracket, and means for limiting the rocking motion of said ring in said bracket, consisting of a limiting pin mounted on said bracket and projecting into a longitudinal groove in said swivel ring.

14. A grinding device for operating on external cylindrical surfaces, comprising a' tubular body, a plurality of abrasive members arranged in an annular row within said body,

means for adjusting said abrasive members radially on the body including cones arranged on the exterior of the body and operatively engaging the opposite ends thereof, means for adjustably connecting said cones and holding them rigidly in position to limit the expansion of said abrasive members, and spring means for holding said cones in their adjusted position, comprising longitudinal retaining rods each secured to one of said cones and sliding on the other cone, and springs each surrounding one of said rods and interposed between said cones.

15. A grinding device for operating on external cylindrical surfaces, comprising a tubular body, a plurality of abrasive members arranged in an annular row within the body, and means for adjusting said abrasive members radially on said body including oppositely disposed conesarranged on the exterior of said. body and movable lengthwise thereof. adjusting plates movable radially on said body and also capable of tilting relative to the axis of the same and each engaging its opposite ends with the opposite ends of one of said abrasive members and also with said oppositely disposed cones, and means for adjusting said cones lengthwise relative to each other.

16. A grinding device for operating on external cylindrical surfaces, comprising a tubular body, a plurality of abrasive members arranged in an annular row within the body, and means for adjusting said abrasive members radially on said body including oppositely disposed cones arranged on the exterior of said body and movable lengthwise thereof, adjusting plates movable radially on said body and also capable of tilting relative to the axis of the same. and each engaging its opposite ends with the opposite ends of one of said abrasive members and also with said oppositely disposed cones, means for adjusting said cones lengthwise relative to each other including a casing which connects with one of said cones and slidingly receives the signature.

MARSDEN O. HUTTO.

other cone, and an adjusting sleeve engaging the last-mentioned cone and adjustably connected with said casing.

17. A grinding device for'operating on external cylindrical surfaces, comprising a tubular body, a plurality of abrasive members arranged in an annular row within the body, and means for adjusting said abrasive members radially on said body including oppositely disposed cones arranged on the exterior of said body and movable lengthwise thereof. adjusting plates movable radially on said body and also capable of tilting relative to the axis of the same and each engaging its opposite ends with the opposite ends of one of said abrasive members and also with said oppositely disposed cones, means for adjusting said cones lengthwise relative to each other including a casing which connects with 

